High-adhesive property watersoluble polyurethane adhesion agent and method of producing the same

Abstract

The invention relates to water-based polyurethane adhesive with high adhesive property and a preparation method thereof, and belongs to the field of polyurethane adhesive. The preparation method comprises the following steps: (1) drying a polylol polymer for 1 to 3 hours in vacuum at a temperature of between 100 and 120 DEG C, reducing the temperature to between 80 and 90 DEG C, dripping diisocyanate into the polylol polymer, polymerizing the mixture for 1 to 1.5 hours, adding small molecular polylol and hydrophilic polylol into the mixture to carry out chain extension and polymerization reaction for 1 to 1.5 hours, then adding the diisocyanate into the mixture, and making the mixture subjected to end capping reaction for 0.5 to 1 hour; (2) dripping neutralizing agent into cross linking polyurethane pre-polymer, and adding acetone into the pre-polymer at the same time to reduce viscosity, wherein the neutralization degree is 95 to 100 percent after the mixture is reacted for 0.5 to 1 hour at a temperature of between 35 and 45 DEG C; (3) dripping the obtained hydrophilic cross linking polyurethane pre-polymer into a mixture of a polyamine compound and water, and dispersing the mixture evenly under high-speed shearing function of an emulsifying machine to obtain water-based polyurethane dispersant; and (4) removing organic solvent in the water-based polyurethane dispersant obtained in step (3) by a vacuum decompressing method. The preparation method effectively solves the problem of difficult emulsifying dispersion caused by cross linking, has simple emulsifying process, and reduces equipment requirement remarkably, has high solid content, reduces cost for production, storage and transportation, improves drying time, and is convenient for gluing operating process.

Description

technical field [0001] The high-cohesive water-based polyurethane adhesive and the preparation method thereof of the invention belong to the field of polyurethane adhesives. Background technique [0002] Water-based polyurethane adhesives use water as the dispersion medium, and have the advantages of environmental protection, non-toxicity, long application life, and resource saving. They are widely used in the bonding of construction, automobiles, home decoration, packaging, printing, leather, handicrafts, etc. Water-based polyurethane adhesives have achieved great development abroad, among which Bayer, BASF and other companies have developed a series of water-based polyurethane adhesives. It started late in China and is in the development stage with broad prospects. At present, the shortcomings of water-based polyurethane adhesives are their low solid content, low degree of crosslinking, and low tensile strength, and the research on the emulsification process is in its inf...

AI Technical Summary

Problems solved by technology

[0003] Aromatic polyurethane adhesives have poor anti-yellowing performance and poor stability. They are prone to violent polymerization during the synthesis process and side reactions are unavoidable. As a result, the performance of aromatic polyurethane adhesives in water-dispersed systems cannot meet the high-end decoration application standards.